Public bug reported:

On Ubuntu 25.04, after intalling MuseScore 3.6.2 (snap) through the App Center 
or using snap on terminal, musescore does not start. Trying to start it from 
the terminal revealed the log:
$ musescore.mscore 

(mscore:10726): Gtk-WARNING **: 16:57:29.951: GTK+ module 
/snap/musescore/228/usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libgail.so cannot 
be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not 
supported.
Gtk-Message: 16:57:29.951: Not loading module "atk-bridge": The functionality 
is provided by GTK natively. Please try to not load it.

(mscore:10726): Gtk-WARNING **: 16:57:29.976: Theme parsing error:
gtk.css:1422:23: 'font-feature-settings' is not a valid property name

(mscore:10726): Gtk-WARNING **: 16:57:29.982: Theme parsing error:
gtk.css:3308:25: 'font-feature-settings' is not a valid property name

(mscore:10726): Gtk-WARNING **: 16:57:29.983: Theme parsing error:
gtk.css:3770:23: 'font-feature-settings' is not a valid property name

(mscore:10726): Gtk-WARNING **: 16:57:30.032: GTK+ module 
/snap/musescore/228/usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libcanberra-gtk-module.so
 cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not 
supported.
Gtk-Message: 16:57:30.033: Failed to load module "canberra-gtk-module"

(mscore:10726): Gtk-WARNING **: 16:57:30.034: GTK+ module 
/snap/musescore/228/usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libcanberra-gtk-module.so
 cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not 
supported.
Gtk-Message: 16:57:30.034: Failed to load module "canberra-gtk-module"
Qt: Session management error: Could not open network socket
Segmentation fault (core dumped)

My workaround was installing the debian package musescore3, which works.
Let me know if you need any more info.

** Affects: ubuntu
     Importance: Undecided
         Status: New

** Description changed:

  On Ubuntu 25.04, after intalling MuseScore 3.6.2 (snap) through the App 
Center or using snap on terminal, musescore does not start. Trying to start it 
from the terminal revealed the log:
- <pre>$ musescore.mscore 
+ $ musescore.mscore 
  
- (mscore:8894): Gtk-<font color="#A2734C"><b>WARNING</b></font> **: <font 
color="#12488B">16:53:28.300</font>: GTK+ module 
/snap/musescore/228/usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libgail.so cannot 
be loaded.
+ (mscore:10726): Gtk-WARNING **: 16:57:29.951: GTK+ module 
/snap/musescore/228/usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libgail.so cannot 
be loaded.
  GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is 
not supported.
- Gtk-<font color="#26A269"><b>Message</b></font>: <font 
color="#12488B">16:53:28.300</font>: Not loading module &quot;atk-bridge&quot;: 
The functionality is provided by GTK natively. Please try to not load it.
+ Gtk-Message: 16:57:29.951: Not loading module "atk-bridge": The functionality 
is provided by GTK natively. Please try to not load it.
  
- (mscore:8894): Gtk-<font color="#A2734C"><b>WARNING</b></font> **: <font
- color="#12488B">16:53:28.323</font>: Theme parsing error:
- gtk.css:1422:23: &apos;font-feature-settings&apos; is not a valid
- property name
+ (mscore:10726): Gtk-WARNING **: 16:57:29.976: Theme parsing error:
+ gtk.css:1422:23: 'font-feature-settings' is not a valid property name
  
- (mscore:8894): Gtk-<font color="#A2734C"><b>WARNING</b></font> **: <font
- color="#12488B">16:53:28.328</font>: Theme parsing error:
- gtk.css:3308:25: &apos;font-feature-settings&apos; is not a valid
- property name
+ (mscore:10726): Gtk-WARNING **: 16:57:29.982: Theme parsing error:
+ gtk.css:3308:25: 'font-feature-settings' is not a valid property name
  
- (mscore:8894): Gtk-<font color="#A2734C"><b>WARNING</b></font> **: <font
- color="#12488B">16:53:28.330</font>: Theme parsing error:
- gtk.css:3770:23: &apos;font-feature-settings&apos; is not a valid
- property name
+ (mscore:10726): Gtk-WARNING **: 16:57:29.983: Theme parsing error:
+ gtk.css:3770:23: 'font-feature-settings' is not a valid property name
  
- (mscore:8894): Gtk-<font color="#A2734C"><b>WARNING</b></font> **: <font 
color="#12488B">16:53:28.376</font>: GTK+ module 
/snap/musescore/228/usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libcanberra-gtk-module.so
 cannot be loaded.
+ (mscore:10726): Gtk-WARNING **: 16:57:30.032: GTK+ module 
/snap/musescore/228/usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libcanberra-gtk-module.so
 cannot be loaded.
  GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is 
not supported.
- Gtk-<font color="#26A269"><b>Message</b></font>: <font 
color="#12488B">16:53:28.376</font>: Failed to load module 
&quot;canberra-gtk-module&quot;
+ Gtk-Message: 16:57:30.033: Failed to load module "canberra-gtk-module"
  
- (mscore:8894): Gtk-<font color="#A2734C"><b>WARNING</b></font> **: <font 
color="#12488B">16:53:28.378</font>: GTK+ module 
/snap/musescore/228/usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libcanberra-gtk-module.so
 cannot be loaded.
+ (mscore:10726): Gtk-WARNING **: 16:57:30.034: GTK+ module 
/snap/musescore/228/usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libcanberra-gtk-module.so
 cannot be loaded.
  GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is 
not supported.
- Gtk-<font color="#26A269"><b>Message</b></font>: <font 
color="#12488B">16:53:28.378</font>: Failed to load module 
&quot;canberra-gtk-module&quot;
+ Gtk-Message: 16:57:30.034: Failed to load module "canberra-gtk-module"
  Qt: Session management error: Could not open network socket
  Segmentation fault (core dumped)
- </pre>
  
  My workaround was installing the debian package musescore3, which works.
  Let me know if you need any more info.

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https://bugs.launchpad.net/bugs/2118929

Title:
  MuseScore 3.6.2 crashes after snap installation

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